Tentative integration of paleoseismic data from lake sediments and from nearby trenches: the central section of the Boconó Fault (northern Venezuela)

Beck, Christian; Carrillo, Eduardo; Audemard, Franck; Welden, Aurélien van; Disnar, Jean-Robert

doi:10.1016/j.jsames.2019.03.028

Cited by 1 publication

(1 citation statement)

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“…Secondly, several homogenite sections of TuHm event deposits actually consist of multiple intervals. This subdivision is different from previously published cases where a homogenite gradually changes upward from faintly layered to structureless (Beck et al ., 2019). Here, the transition (Hm1/Hm2 on Figs 6, 7C and 7D) involves sharp changes in chemical and textural parameters.…”

Section: Discussionmentioning

confidence: 99%

Multi‐scale and multi‐parametric analysis of Late Quaternary event deposits within the active Corinth Rift (Greece)

et al. 2022

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A major challenge in subaqueous palaeoseismology is to understand the relationship between an earthquake/tsunami and a sedimentary event deposit recorded in drillcores. Expedition 381 of the International Ocean Discovery Program was dedicated to understanding the development of the Corinth Rift, Greece. Its drilled cores provide a potentially important resource to better understand depositional mechanisms of sedimentary event deposits within changing open marine to (semi-)isolated environments. To achieve this, Uchannels and spatula samples were analysed from the topmost part (0-65 m below seafloor maximum depth) of holes M0078B and M0079A (ca 0-25 ka), using high-resolution X-ray microtomography in combination with grain-size, magnetic and X-ray fluorescence measurements. Structures and grain fabric are resolved down to 10 lm in voxel size, characterizing the geometry of the basal surface of 'turbidite+homogenite' sedimentary event deposits, and the internal base-upward evolution at high-resolution scale. This analysis suggests that these types of deposits are more complex than previously proposed, especially at the transition between the basal coarse turbidite sub-unit and the fine-grained homogenite upper sub-unit, as well as within the homogenite. Combined with the other observations and parameters, X-ray microtomography results are consistent with the interpretation of the Corinth 'turbidite+homogenite' deposits as having predominantly originated from seismic and/or aseismic slope failures followed by tsunami/seiche effects, despite subtle differences according to depositional environment.

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Section: Discussionmentioning

confidence: 99%